Add new troubleshooting step and refactor Geo replication docs

Closes #63210

See merge request gitlab-org/gitlab-ce!29783

Fixed formatting of notes bullet list

See merge request gitlab-org/gitlab-ce!29923

Disallow `NULL` values for `geo_nodes.primary` column

Closes gitlab-ee#12061

See merge request gitlab-org/gitlab-ce!29818

Backport and Docs for Paginate license management and add license search

See merge request gitlab-org/gitlab-ce!27602

Add back trimChar method to remove trailing +/-

Closes #59028

See merge request gitlab-org/gitlab-ce!29518

Add test for checking output

Resolve "Race condition in fetching Kubernetes token causes missing `$KUBECONFIG`"

Closes #63507

See merge request gitlab-org/gitlab-ce!29922

Enabled complex ci variable expression statements by default

See merge request gitlab-org/gitlab-ce!29904

Do not rewrite relative links for system notes

Closes #63162

See merge request gitlab-org/gitlab-ce!29825

Since Kubernetes is creating the Secret and token asynchronously it is
necessary that we implement some delay or retrying logic to avoid a race
condition where we fetch a Secret before the token is even set. There
does not appear to be any way for us to force it to be set with any
synchronous API call so retrying seems to be the only option.

Remove Kubernetes service from deployment platform

See merge request gitlab-org/gitlab-ce!29786

Docs: Change wording

See merge request gitlab-org/gitlab-ce!29746

Remove fallback to platform credentials for managed project-level clusters

Closes #62772

See merge request gitlab-org/gitlab-ce!29262

Project-level clusters that made use of this legacy
behaviour have been migrated to unmanaged clusters,
so we are now free to remove this fallback.

This will no longer be used for deployments, as all
service templates have been migrated to clusters.

Migrate managed clusters that aren't using managed features to unmanaged

Closes #62772

See merge request gitlab-org/gitlab-ce!29251

Migrate clusters with no token to unmanaged

Closes #62772

See merge request gitlab-org/gitlab-ce!29648

Omit issues links in merge request entity API response

Closes #63546

See merge request gitlab-org/gitlab-ce!29917

using_docker_images.md: fix config.json path

See merge request gitlab-org/gitlab-ce!29791

The merge request widget has a section that includes which issues may be
closed or mentioned based on the merge request description. The problem
is that rendering and redacting Markdown can be expensive, especially
since the browser polls for the data every 10 seconds.

Since these links don't change much and are just nice to have, we only
load them on first page load. The frontend will use the existing data if
the data doesn't appear on subsequent requests.

This saves about 30% of the rendering time of this endpoint, which adds
up to significant savings considering that
`MergeRequestsController#show.json` is called over a million times a day
on GitLab.com.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63546

Make deploy_boards doc clearer about its requirements

See merge request gitlab-org/gitlab-ce!29682

There are clusters that have Kubernetes namespaces
stored which are missing a service account token.
These namespaces are unable to be used for deployments,
so marking the clusters as unmanaged will allow the
platform credentials to be used instead.

Update Grafana and GitLab Monitor in component list

See merge request gitlab-org/gitlab-ce!29537

This commit checks off two of the three components in the table that we
added for the CEO Challenge in Contribute 2019:

* Grafana:
  https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/3272

* GitLab Monitor:
  https://gitlab.com/charts/gitlab/merge_requests/787

Update docs on how to run E2E tests

See merge request gitlab-org/gitlab-ce!29823

Add Gitaly data to the usage ping

See merge request gitlab-org/gitlab-ce!29893

Add documentation on epic add/remove child relations quick actions

See merge request gitlab-org/gitlab-ce!29860

Use next_instance_of instead of any_instance_of

See merge request gitlab-org/gitlab-ce!29905

Backport changes made by EE to various YAML configuration files

See merge request gitlab-org/gitlab-ce!29606

For prepended classes, we need to use `expect_next_instance_of`
instead of RSpecs `any_instance_of` variants.

Errors in application settings panel shows wrong panel

See merge request gitlab-org/gitlab-ce!25434

Fixed failing GraphQL file import

Closes #63527

See merge request gitlab-org/gitlab-ce!29900

Improve bug severity definitions and consolidate guidance for clarity

See merge request gitlab-org/gitlab-ce!29694